diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 89842a1c..caaffef1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,19 +15,12 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v2
 
-      - name: Install Rust
-        uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          override: true
-          components: rustfmt, clippy
-
       - name: Cache ~/.cargo/bin directory
         id: cargo-bin-cache
         uses: actions/cache@v2.1.4
         with:
           path: ~/.cargo/bin
-          key: ubuntu-rust-${{ env.RUST_TOOLCHAIN }}-cargo-bin-directory-v1
+          key: ubuntu-rust-${{ hashFiles('rust-toolchain') }}-cargo-bin-directory-v1
 
       - name: Install tomlfmt
         if: steps.cargo-bin-cache.outputs.cache-hit != 'true'
@@ -63,19 +56,13 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v2
 
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          override: true
-
       - name: Cache target and registry directory
         uses: actions/cache@v2.1.4
         with:
           path: |
             target
             ~/.cargo/registry
-          key: rust-${{ matrix.target }}-build-${{ hashFiles('Cargo.lock') }}-v1
+          key: rust-${{ matrix.target }}-build-${{ hashFiles('Cargo.lock') }}-${{ hashFiles('rust-toolchain') }}-v1
 
       - name: Build binary
         run: |
@@ -110,19 +97,13 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v2
 
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          override: true
-
       - name: Cache target and registry directory
         uses: actions/cache@v2.1.4
         with:
           path: |
             target
             ~/.cargo/registry
-          key: rust-${{ matrix.target }}-test-${{ hashFiles('Cargo.lock') }}-v1
+          key: rust-${{ matrix.target }}-test-${{ hashFiles('Cargo.lock') }}-${{ hashFiles('rust-toolchain') }}-v1
 
       - name: Build tests
         run: cargo build --tests --workspace --all-features
@@ -152,19 +133,13 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v2
 
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          override: true
-
       - name: Cache target and registry directory
         uses: actions/cache@v2.1.4
         with:
           path: |
             target
             ~/.cargo/registry
-          key: rust-${{ matrix.target }}-test-${{ hashFiles('Cargo.lock') }}-v1
+          key: rust-${{ matrix.target }}-test-${{ hashFiles('Cargo.lock') }}-${{ hashFiles('rust-toolchain') }}-v1
 
       - name: Run test ${{ matrix.test_name }}
         run: cargo test --package swap --all-features --test ${{ matrix.test_name }} ""
diff --git a/rust-toolchain b/rust-toolchain
index 97e6da5f..b431082c 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1,3 @@
-nightly-2021-01-31
+[toolchain]
+channel = "nightly-2021-01-31"
+components = ["rustfmt", "clippy"]